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Mollusca (132 791)
Subphylum Aculifera
Subphylum Conchifera
Subphylum Placophora accepted as Polyplacophora
Superclass Aplacophora
Class Amphineura accepted as Aculifera
Class Bivalvia (25 009)
Class Caudofoveata (143)
Class Cephalopoda (1 834)
Class Conchifera accepted as Bivalvia
Class Cricoconarida † (1)
Class Gastropoda (102 697)
Subclass Amphigastropoda † (390)
Subclass Angiogastropoda represented as Gastropoda
Subclass Apogastropoda
Subclass Caenogastropoda (53 636)
Subclass Gastropoda incertae sedis (308)
Subclass Heterobranchia (39 156)
Infraclass "Lower Heterobranchia" (1 137)
Infraclass Euthyneura (37 433)
Subterclass Acteonimorpha (411)
Subterclass Ringipleura (2 917)
Subterclass Tectipleura (34 105)
Superorder Acochlidiimorpha (48)
Superorder Ascoglossa accepted as Sacoglossa
Superorder Basommatophora accepted as Hygrophila
Superorder Eupulmonata (25 569)
Superorder Hygrophila (2 005)
Superfamily Acroloxoidea Thiele, 1931 accepted as Lymnaeoidea Rafinesque, 1815
Superfamily Chilinoidea Dall, 1870 (61)
Superfamily Lymnaeoidea Rafinesque, 1815 (1 944)
Family Acroloxidae Thiele, 1931 (58)
Family Ancylidae Rafinesque, 1815 accepted as Ancylinae Rafinesque, 1815
Family Bulinidae P. Fischer & Crosse, 1880 (72)
Family Burnupiidae Albrecht, 2017 (22)
Family Clivunellidae Kochansky-Devidé & Slišković, 1972 † (4)
Family Laevapicidae Hannibal, 1914 accepted as Planorbidae Rafinesque, 1815
Family Lancidae Hannibal, 1914 accepted as Lancini Hannibal, 1914
Family Limnophysidae W. Dybowski, 1903 accepted as Lymnaeidae Rafinesque, 1815
Family Lymnaeidae Rafinesque, 1815 (536)
Family Physidae Fitzinger, 1833 (210)
Subfamily Aplexinae Starobogatov, 1967 (73)
Genus Afrophysa Starobogatov, 1967 (1)
Genus Amecanauta D. W. Taylor, 2003 (1)
Genus Amuraplexa Starobogatov & Prozorova, 1989 (2)
Genus Aplecta Herrmannsen, 1846 accepted as Aplexa J. Fleming, 1820
Genus Aplexa J. Fleming, 1820 (44)
Genus Austrinauta D. W. Taylor, 2003 (1)
Genus Caribnauta D. W. Taylor, 2003 (1)
Genus Mayabina D. W. Taylor, 2003 (10)
Genus Mexinauta D. W. Taylor, 2003 (8)
Species Mexinauta aurantia (P. P. Carpenter, 1857) accepted as Mexinauta aurantius (P. P. Carpenter, 1857)
Species Mexinauta aurantius (P. P. Carpenter, 1857)
Species Mexinauta gracilentus (P. Fischer & Crosse, 1886)
Species Mexinauta impluviatus (Morelet, 1849)
Species Mexinauta laetus (E. von Martens, 1898)
Species Mexinauta nicaraguanus (Morelet, 1851)
Species Mexinauta nitens (R. A. Philippi, 1841)
Species Mexinauta peruvianus (J. E. Gray, 1828)
Species Mexinauta princeps (J. S. Phillips, 1846)
Genus Paraplexa Starobogatov, 1989 (1)
Genus Sibirenauta Starobogatov & Streletzkaja, 1967 (3)
Genus Tropinauta D. W. Taylor, 2003 (1)
Subfamily Physinae Fitzinger, 1833 (130)
Genus Berellaia de Laubrière & Carez, 1881 † (5)
Genus Hannibalina G. D. Hanna & Gester, 1963 † (1)
Genus Petrophysa Pilsbry, 1926 accepted as Physella Haldeman, 1842
Genus Prophysa Bandel, 1991 † (1)
Family Planorbidae Rafinesque, 1815 (1 042)
Family Rhodacmeidae B. Walker, 1917 accepted as Ancylinae Rafinesque, 1815
Superfamily Planorboidea Rafinesque, 1815 accepted as Lymnaeoidea Rafinesque, 1815
Superorder Pneumopulmonata
Superorder Pylopulmonata (4 285)
Superorder Sacoglossa (391)
Superorder Siphonarimorpha (163)
Order Anaspidea accepted as Aplysiida
Order Aplysiida (101)
Order Aplysiomorpha accepted as Aplysiida
Order Archaeopulmonata accepted as Siphonarioidea Gray, 1827
Order Bullomorpha accepted as Cephalaspidea
Order Cephalaspidea (1 034)
Order Heterostropha accepted as Pyramidellidae J. E. Gray, 1840
Order Pteropoda (414)
Order Runcinacea accepted as Runcinida
Order Runcinida (80)
Order Tectibranchiata
Order Thecosomata
Order Umbraculida (15)
Superorder Euthyneura incertae sedis
Infraclass Heterobranchia incertae sedis (478)
Infraclass Mesoneura (108)
Infraclass Opisthobranchia
Infraclass Pulmonata
Subclass Neomphaliones accepted as Vetigastropoda
Subclass Neritimorpha (1 914)
Subclass Orthogastropoda represented as Gastropoda
Subclass Patellogastropoda (511)
Subclass Prosobranchia
Subclass Psilogastropoda represented as Gastropoda
Subclass Vetigastropoda (6 782)
Class Lamellibranchiata accepted as Bivalvia
Class Loricata accepted as Polyplacophora
Class Mollusca incertae sedis † (372)
Class Monoplacophora (229)
Class Pelecypoda accepted as Bivalvia
Class Polyplacophora (1 377)
Class Polyplaxiphora accepted as Polyplacophora
Class Rostroconchia † (64)
Class Scaphopoda (752)
Class Solenoconchia accepted as Scaphopoda
Class Solenogastres (313)
Subclass Chaetodermomorpha accepted as Caudofoveata